Cookies Policy

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here


No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.

Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.

This Article is currently unavailable for purchase.
Add to Favorites
You must be logged in to use this functionality

Cover image Placeholder

ABSTRACT Hutchinsoniella macracantha is a simultaneous hermaphrodite. The small, paired ovaries are cephalic. From each, a long oviduct runs posteriorly to the eighteenth trunk segment, where it loops forward and runs toward the sixth trunk segment. The paired, sausage-shaped testes are dorsal to the midgut in the anterior end of the abdomen. A vas deferens runs down from the anterior end of each testis to join the oviduct. A common gonoduct exits on the posterior face of the sixth thoracopod. The ovaries contain no nurse or follicle cells, although projections from the epithelial cells and oocytes intertwine in the core of the ovary. The mechanism for translocating oocytes along the oviduct is problematical; a conveyor belt hypothesis is offered. Vitellogenesis does not begin until the posterior loops of the oviduct. Only 1 pair of oocytes matures at a time. Spermatogonia are scattered over the length of the testes. Each multiplies to form a small cluster of simultaneously developing spermatocytes; there are no cytoplasmic bridges or nurse cells. Within the testes, sperm formation is asynchronous and continuous. In addition to the acrosome, nucleus, and aflagellar central rod, each sperm cell forms voluminous vacuoles in the remaining cytoplasm; the associated volume increase probably causes mature sperm to enter and move through the testicular central lumen into the vas deferens. There is no obvious morphological obstacle to self fertilization. Each huge (approximately 0.4 mm long) ovum is attached to the ninth thoracopod with cement secreted by glands located midventrally in the ninth thoracic segment.


Full text loading...


Data & Media loading...

Article metrics loading...



Can't access your account?
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation